Fan array fan section in air-handling systems

1. A control system for an air-handling system having (a) an air-handling compartment; (b) a fan array including at least three fan units positioned within the air-handling compartment; (c) the air-handling compartment associated with a building such that the air-handling system conditions the air of at least a portion of the building, the control system comprising:

a user input configured to permit a user to program a selected performance level for one or more of i) air volume, ii) air pressure, or iii) a pattern of air flow;

an output coupled to the fan array of at least three fan units; and

an array controller configured to operate the fan units substantially at or above the selected performance level at least by controlling a speed of ones of the fan units that are ON.

2. The control system of claim 1 , wherein the array controller is configured to take the fan units on and off line when the selected performance level corresponds to a low volume of air at a relatively high pressure.

3. The control system of claim 2 , wherein the array controller is configured to modulate the fan units on and off line to produce a select operating point.

4. The control system of claim 3 , wherein the select operating point represents a stable operating point.

5. The control system of claim 3 , wherein the array controller is configured to modulate the fan units on and off to eliminate surge effects, where the surge effect occurs when a system pressure is too high for the fan speed at a given volume and the fan units have a tendency to go into stall.

6. The control system of claim 1 , wherein the array controller is configured to take off line a number of the fan units and speed up on-line fan units, to avoid a surge effect, where the surge effect occurs when a system pressure is too high for the fan speed at a given air volume programmed by the user and the fan units have a tendency to go into stall.

7. The control system of claim 1 , wherein the array controller is configured to modulate the fan units on and off line and control the speed of the fan units that are on line to produce a stable operating point and avoid stall when the selected performance level is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

8. The control system of claim 1 , wherein the array controller is programmed to control a speed of said fan units to operate above synchronous speed.

9. The control system of claim 1 , wherein the array controller controls the fan units by i) taking fan units on-line and ii) taking fan units off-line in connection with maintaining the selected performance level that is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

10. The control system of claim 1 , wherein the array controller is configured to automatically turn ON and turn OFF individual fan units in connection with maintaining the selected performance level that is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

11. The control system of claim 1 , wherein the array controller is configured to permit a user to manually turn ON and turn OFF the individual fan units.

12. The control system of claim 1 , wherein the array controller is configured to meet a current air demand by operating all of the fan units at a first fan speed and wherein the fan array is configured to meet the current air demand by operating a subset of the fan units at a second fan speed faster than the first fan speed when the selected performance level is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

13. A method for configuring a control system for an air-handling system having (a) an air-handling compartment; (b) a fan array including at least three fan units positioned within the air-handling compartment; (c) the air-handling compartment associated with a building such that the air-handling system conditions the air of at least a portion of the building, the method comprising:

providing an array controller with an output configured to be coupled to the fan array of at least three fan units;

configuring the array controller to permit a user to program a selected performance level for one or more of i) air volume, ii) air pressure, or iii) a pattern of air flow; and

configuring the array controller to operate the fan units substantially at or above the selected performance level at least by controlling a speed of ones of the fan units that are ON.

14. The method of claim 13 , further comprising configuring the array controller to take the fan units on and off line when the selected performance level corresponds to a low volume of air at relatively high pressure.

15. The method of claim 14 , further comprising modulating the fan units on and off line, at the direction of the array controller, to produce a select operating point.

16. The method of claim 15 , wherein the select operating point represents a stable operating point.

17. The method of claim 14 , further comprising configuring the array controller to modulate the fan units on and off to eliminate surge effects, where the surge effect occurs when a system pressure is too high for the fan speed at a given volume and the fan units have a tendency to go into stall.

18. The method of claim 13 , further comprising configuring the array controller to take off line a number of the fan units and speed up on-line fan units, to avoid a surge effect, wherein the surge effect occurs when a system pressure is too high for the fan speed at a given air volume programmed by the user and the fan units have a tendency to go into stall.

19. The method of claim 13 , further comprising modulating the fan units on and off line and controlling the speed of the fan units that are on line to produce a stable operating point and avoid stall when the selected performance level is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

20. The method of claim 13 , further comprising: turning OFF at least one of the fan units to form an off-line fan unit set; turning ON at least one of the fan units to form an on-line fan unit set; and adjusting a speed of the on-line fan unit set to at least meet a current air demand which represents at least a portion of a specified air capacity when the selected performance level is programmed for one or more of the air volume, the air pressure and the pattern of air flow.

21. The method of claim 13 , further comprising programming the array controller to control a speed of the fan units to operate above synchronous speed.

22. The method of claim 13 , further comprising manually taking off-line and on-line individual fan units.

23. The method of claim 13 , further comprising turning ON a group of fan units to meet a specified air capacity while keeping at least one redundant fan unit off-line and operating the group of fan units at or above the selected performance level which represents at least a portion of the specified air capacity.

24. The method of claim 23 , further comprising turning OFF a disabled fan unit from the group of fan units and turning ON the at least one redundant fan in order to still at least meet the selected performance level.

25. The method of claim 13 , further comprising turning ON only a number of the fan units required to meet the selected performance level.

26. The method of claim 13 , further comprising turning OFF one or more individual fan units that i) need to be replaced, ii) are not working properly or iii) need maintenance.